What further information is revealed about the Eynsford Hills and the personalities of the family members?

Answers
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In this act we witness the transformation of Liza the flower-girl into Eliza the society lady. The change caused by repackaging her in new clothing and providing her with a new accent is so complete that she goes unrecognized by people who have seen her in her former state. Even the rough content of her conversation does not reveal her class, despite the concerns of the people who know to look out for such content.

The fact that Freddy becomes instantly smitten with her emphasizes the concept of infatuation on the basis of external characteristics. He barely noticed her when she was a flower-girl, but the change in her looks and her talk has made her infinitely more attractive to him. These characteristics make her seem to be of a class much higher than before. The location makes a difference, too; what would a girl like Liza be doing in such a respectable home? Furthermore, the fact that the other characters play her as a cultured woman makes it harder for the visitors to become suspicious.